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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Inventories | $ 2,135 | $ 1,921
Compensation and benefits | 1,225 | 2,647
Accrued liabilities and reserves | 4,181 | 5,187
Property, plant and equipment | 647 | 1,045
Tax loss carryforwards | 8,437 | 10,929
Tax credit carryforwards | 26,221 | 29,744
Other | 410 | 416
Gross deferred tax assets | 43,256 | 51,889
Less: Valuation allowance | (8,962) | (11,986)
Deferred tax assets less valuation allowance | 34,294 | 39,903
Deferred tax liabilities: |  |
Property, plant and equipment | (2,545) | (3,489)
Intangible assets | (16,683) | (22,067)
Outside basis difference in foreign subsidiary | (13,750) | (13,750)
Other | (4,090) | (3,243)
Gross deferred tax liabilities | (37,068) | (42,549)
Net deferred tax liabilities | $ (2,774) | $ (2,646)

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